Home / 20,970.60-31,471.27-15,438.85

Finding the Fourth Proportional to 20,970.60, 31,471.27 and 15,438.85

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Solution

The fourth proportional to 20,970.60, 31,471.27 and 15,438.85 is: 23,169.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.60 : 31,471.27 = 15,438.85 : x
  2. Step 2: Convert to fraction form
    20,970.60/31,471.27 = 15,438.85/x
  3. Step 3: Cross multiply
    20,970.60x = 31,471.27 × 15,438.85
  4. Step 4: Simplify right side
    20,970.60x = 485,880,341.72
  5. Step 5: Solve for x
    x = 485,880,341.72/20,970.60
  6. Step 6: Final answer
    x = 23,169.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.